Iron Vacancy Ordered γ-Fe_2O_3 (001) Epitaxial Films : The Crystal Structure and Electrical Resistivity(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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We report the structural characterization and transport properties of highly-ordered epitaxial γ-Fe_2O_3 thin films grown by a pure ozone-assisted molecular beam epitaxy method. X ray diffraction (XRD) measurements at a synchrotron facility indicated that the composition of films was close to that of γ-Fe_2O_3 with Fe vacancy only occurring at octahedral sites of a spinel. We revealed that the crystal symmetry was reduced from a cubic, giving rise to extra superlattice reflections along the c axis and this showed good agreement with a tetragonal structure with c&Isim;3a. We succeeded in determining the position of vacancy sites as well as the unit cell by comparing the XRD results with calculated reflection patterns for plausible vacancy ordered models. The temperature dependent resistivity of the vacancy ordered γ-Fe_2O_3 was several orders higher than that of Fe_3O_4.
- 2006-05-15
著者
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KITA Eiji
Institute of Applied Physics, University of Tsukuba
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WAKABAYASHI Yusuke
Photon Factory, Institute of Materials Structure Science
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SAWA Hiroshi
Photon Factory, Institute of Materials Structure Science
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Wakabayashi Yusuke
Photon Factory Institute Of Materials Structure Science
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YANAGIHARA Hideto
Institute of Applied Physics, University of Tsukuba
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Wakabayashi Yusuke
Photon Factory Institute Of Materials Structure Science High Energy Accelerator Research Organizatio
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Kita Eiji
Institute Of Applied Physics University Of Tsukuba
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Siratori Kiiti
Photon Factory Institute Of Materials Structure Science High Energy Accelerator Research Organizatio
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Sawa Hiroshi
Photon Factory Institute Of Materials Structure Science High Energy Accelerator Research Organizatio
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Yanagihara Hideto
Institute Of Applied Physics University Of Tsukuba
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Sawa Hiroshi
Photon Factory Institute Of Materials Structure Science
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HASEGAWA Manabu
Institute of Applied Physics, University of Tsukuba
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Hasegawa Manabu
Institute Of Applied Physics University Of Tsukuba
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Kita Eiji
Institute For Applied Physics Tsukuba University
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WAKABAYASHI Yusuke
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization
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SIRATORI Kiiti
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization
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SAWA Hiroshi
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization
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